MCQ 11 MarkWhich of the following is a chemical change?AEvaporation of water✓Burning of fuelsCMoving of a wheelDBreaking of a brickAnswerCorrect option: B. Burning of fuelsView full question & answer→
MCQ 21 MarkWhich of the following is not a man$-$made change?✓Change of day and nightBBurning of fuelsCDrying of clothesDTearing of paperAnswerCorrect option: A. Change of day and nightView full question & answer→
MCQ 31 MarkConversion of a solid to liquid by heating is calledAevaporation✓meltingCcondensationDfreezingAnswerCorrect option: B. meltingView full question & answer→
MCQ 41 MarkRusting of iron is an example of✓slow changeBfast changeCreversible changeDphysical changeAnswerCorrect option: A. slow changeView full question & answer→
MCQ 51 MarkWhich is a way to make a change happen?AHeating a substanceBCooling a substanceCMixing a substance with another substance✓All of theseAnswerCorrect option: D. All of theseView full question & answer→
MCQ 61 MarkWhich one of the steps while burning a candle is not reversible?AMelting of solid waxBliquid wax changes into vapours✓Wax vapour bums into flameDAll of theseAnswerCorrect option: C. Wax vapour bums into flameView full question & answer→
MCQ 71 MarkOn heating metal rim✓expandsBcontractsCdepends how much it is heatedDdepends as the type of metedAnswerCorrect option: A. expandsView full question & answer→
MCQ 81 MarkMetal rim is fixed to the wooden cart wheel by✓heating metal rimBheating wooden wheelCcooling metal rimDcooling wooden wheelAnswerCorrect option: A. heating metal rimView full question & answer→
MCQ 91 MarkWhich of the following changes cannot be reversed?✓Milk to paneerBCold milk to hot milkCYam to knitted sweaterDWet clothes to dry clothesAnswerCorrect option: A. Milk to paneerView full question & answer→
MCQ 101 MarkWhich of the following changes can be reversed?ARaw egg to boiled egg✓Wet clothes to dry clothesCBud to flowerDCow dung to biogasAnswerCorrect option: B. Wet clothes to dry clothesView full question & answer→